Abstract
High-speed light source is realized for decoy-state quantum key distribution
(QKD) at telecom wavelength of 1.55 µm. By implementing two different
electrical pulses together and triggering with 100 MHz pseudorandom number to drive
the laser diode, the signal-state and the decoy-state pulses are prepared with
identical pulse duration of 25 ps and similar spectral characteristics, avoiding the
eavesdropper's attack by temporal and spectral analysis. The intensity fluctuation
of the light source is quantified to satisfy the practical decoy-state QKD with
random intensity error. The characteristics of the light source are analyzed with a
high-speed single-photon detector.
© 2014 Chinese Optics Letters
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